JP6409489B2 - Laminate tube manufacturing method - Google Patents

Description

  The present invention relates to a laminate tube. In particular, the present invention relates to a method for manufacturing a laminated tube including a metal vapor-deposited film in a body laminate.

  A laminated tube is a type of tube that uses a laminated sheet of plastic film, special paper, aluminum foil, etc., and joins the body part and the shoulder with the mouth part where the laminated sheet is wound. Manufactured. Its uses are widely used to put semi-solid materials such as foods, dentifrice pastes, pharmaceuticals, cosmetics, paints and adhesives, and are indispensable for daily life.

  During the manufacturing process, printing is also performed on a plastic film used for a laminate constituting a tube for the purpose of improving designability, displaying contents or providing information as a packaging material. In order to impart a metallic luster for the purpose of improving design properties, a metal such as aluminum may be vapor-deposited on a plastic film.

  In the manufacturing process by the AMS machine, the laminated tube is a state in which a part of the cut end surface is bent outward because it is pushed in one direction from the top after laminating the laminated body constituting the tube in a cylindrical shape. If the shoulder is attached in this state, the end face of the metal-deposited film may be exposed. In the state where this end face is exposed, for example, when a content containing a component that dissolves the metal vapor deposition layer such as a toothpaste adheres, the metal vapor deposition layer dissolves and the laminate may be peeled off.

Japanese Patent Laid-Open No. 5-112366 JP 2006-264005 A JP-A-2005-126118

  The present invention has been made in view of such a situation, and in a method of manufacturing a laminated tube including a metal vapor-deposited film in a laminate constituting a body portion, the metal vapor-deposited layer at the shoulder of the laminate tube is dissolved, and lamination is thereby performed. An object of the present invention is to provide a method for producing a laminated tube that does not cause delamination of the body.

  As a means for solving the above-mentioned problems, the invention according to claim 1 is a method for manufacturing a laminate tube in which a body portion is formed of a laminate including a metal-deposited film. After forming a cylindrical shape, a mandrel is inserted, and a barrel portion is formed so that the end face faces inward by pushing through two or more arc-shaped blades from above the cylindrical laminate, and the end portion of the barrel portion A method for producing a laminated tube is characterized by forming a shoulder of the tube.

  The invention described in claim 2 is the method for manufacturing a laminate tube according to claim 1, wherein the diameter of the body of the laminate tube is 20 mm or more.

  The invention according to claim 3 is the laminate tube according to claim 1 or 2, wherein the thickness of the laminate constituting the laminate tube body is in the range of 200 μm to 500 μm. It is a manufacturing method.

  According to the present invention, in a laminated tube including a metal vapor-deposited film in a laminate constituting the body part, the metal vapor-deposited film layer is formed even if a shoulder is formed by compression molding because the cross section of the end surface of the body part faces inward. The metal vapor deposition layer is not exposed at the connecting portion between the end of the trunk and the shoulder, and therefore, even when a content containing a component that dissolves the metal vapor deposition layer, such as a toothpaste, adheres, It is possible to provide a method for producing a laminated tube in which the deposited layer does not dissolve and does not cause delamination of the film.

  According to the invention of claim 2, when the diameter of the laminate tube barrel is 20 mm or more, the barrel can be more easily and reliably cut.

  According to the invention of claim 3, when the thickness of the laminate constituting the laminate tube barrel is in the range of 200 μm to 500 μm, the barrel can be cut more easily and reliably.

FIG. 1 is a schematic view of cutting a laminated tube body according to the present invention. FIG. 2 is a schematic cross-sectional view of a laminate tube body according to the present invention. FIG. 3 is a partial cross-sectional schematic view of an embodiment of a laminate of the body portion of the laminated tube according to the present invention. FIG. 4 is a schematic sectional view of compression molding of a laminated tube shoulder according to the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS. 1 to 3. First, a laminate tube according to the present invention is composed of a laminate in which a body portion includes two or more layers based on a polyethylene terephthalate film, and a polyethylene terephthalate film vapor-deposited on the metal is disposed outside the center in the thickness direction of the laminate. It is formed into a continuous cylindrical shape by a seal.

  The cylinder is then cut to the length of the individual laminate tube. A mandrel is inserted inside the cylinder, and two or more arcuate blades are applied from the top and bottom to the mandrel. Take a way to push it all the way.

  Thereby, the cross section of the end face of the body part is cut in a shape facing inward from the circumference of the body part. The shoulder is attached by compression molding. At this time, the end of the torso is cut inward from the torso circumference, and the cross section is formed inward. The cross section of the metal vapor deposition layer of the polyethylene terephthalate film vapor-deposited from the connection portion is not exposed. As a result, even if a content containing a component that dissolves the metal vapor deposition layer such as a toothpaste is attached to the connecting portion between the body and the shoulder, the metal vapor deposition layer does not dissolve from that portion.

FIG. 1 is a schematic view of cutting a laminated tube body according to the present invention. A laminate (1) including two or more layers based on a polyethylene terephthalate film, of which a metal-deposited polyethylene terephthalate film is disposed outside the center, is formed into a cylindrical shape by a side seal.

  The mandrel (2) is inserted into the molded laminate (1), while the arcuate blade (3a) and the arcuate blade (3b) are disposed outside the cylindrical laminate (1). The The arcuate blades are composed of two or more, and are arranged so as to surround the circumference of the laminated body formed into a cylindrical shape.

  In the example shown in FIG. 1, two arc-shaped blades are used. The sum of the lengths of the arcuate blade portions must be equal to or greater than the circumferential length of the cylindrically shaped laminate (1) in order to avoid uncut portions.

  In the cutting, the arcuate blade (3a) and the arcuate blade (3b) move inward to push the laminated body (1) formed into a cylindrical shape between the mandrel (2) from the outside to the inside. Is done.

  The cut cylinder becomes the body (4) of the laminate tube having the end face (5), and in the next step, the shoulder opening and the end face (5) are connected by compression molding to produce the laminate tube.

  FIG. 2 is a schematic cross-sectional view of a laminate tube body according to the present invention. The body (10) is formed into a cylindrical shape, and the diameter (15) is the diameter of the outermost surface (11) of the laminate. Moreover, the polyethylene terephthalate film (12) by which metal vapor deposition was carried out outside the thickness direction center (13) of the total thickness (14) of a laminated body is arrange | positioned.

  FIG. 3 is a partial cross-sectional schematic view of an embodiment of a laminate of the body portion of the laminated tube according to the present invention. The configuration of the laminate will be further described in detail.

  The laminate used for the body of the laminate tube according to the present invention comprises two or more layers based on a polyethylene terephthalate film, of which a metal-deposited polyethylene terephthalate film is disposed outside the center in the thickness direction. .

  The laminate used for the body of the laminated tube according to the present invention uses, for example, a white polyethylene film as the base material layer (17), and the metal vapor-deposited film as a metal vapor-deposited film (18) on the side that becomes the laminated tube outer side (23). A polyethylene terephthalate film is placed. By arranging in this way, visual recognition from the outside (23) of the laminate tube becomes possible, and the design property that is the purpose of metal deposition can be improved.

  In laminating the metal-deposited polyethylene terephthalate film, the vapor-deposited surface can be placed toward the outer side of the laminate tube (23). You may arrange | position toward (24).

Further, a low density linear polyethylene film is laminated as a sealant layer (19) on the outside of the metal-deposited polyethylene terephthalate film. The sealant layer (19) may be laminated using a film, or the sealant layer may be formed using an extruder. As the resin system used for the sealant layer (19), for example, a polyethylene resin or a polypropylene resin can be used.
Lamination of these films may be bonded using an adhesive, or may be bonded by providing, for example, a polyethylene resin layer by an extruder. When a polyethylene film is used, a printed layer (22) or a coating layer (25) can be provided on the surface for the purpose of improving design properties, displaying contents, or providing information.

  In addition to the metal-deposited polyethylene terephthalate film (12) contained in the laminate, another polyethylene terephthalate film-based layer is a gas barrier film (20), which is a white polyethylene which is a substrate layer (17) The film is provided on the side opposite to the metal-deposited polyethylene terephthalate film, that is, on the liquid contact side (24).

  The gas barrier film (20) is composed of a polyethylene terephthalate film and a gas barrier layer. The gas barrier layer is formed by providing an inorganic compound layer on a base film by a vapor deposition method, and may further provide an inorganic compound layer by a coating method.

  A composite of two layers of the inorganic compound layer by the vapor deposition method and the inorganic compound layer by the coating method produces a reaction layer of both layers at the interface between the inorganic compound layer by the vapor deposition method and the inorganic compound layer by the coating method, or the coating method A dense structure is formed by filling and reinforcing defects or fine holes such as pinholes, cracks, and grain boundaries generated in the inorganic compound layer by the vapor deposition method.

  Therefore, high gas barrier properties, moisture resistance, and water resistance are realized, and it has flexibility to withstand deformation, and can be suitable for repeated use. Moreover, since it can avoid using metal foils, such as aluminum foil, as a gas barrier layer, when it uses for a laminate tube, it is advantageous in the form recoverability.

  Compared to gas barrier layers made of metal foils such as aluminum foil, gas barrier layers made by laminating inorganic compound layers by vapor deposition methods or by coating methods use metal detectors in processes such as filling and sealing contents. There is an advantage that the used foreign matter inspection becomes possible. In addition, since any inorganic compound layer is colorless and transparent, the contents can be visualized when the other layers of the laminate are also transparent.

  When laminating the gas barrier film (20), the surface of the gas barrier layer may be arranged facing the outside (23) of the laminate tube in consideration of the adhesion between the layers of the laminate, and the liquid contact surface side (24) It does not matter if it is placed facing.

  Furthermore, a low density linear polyethylene layer is provided as a sealant layer (21) on the outside. The sealant layer (21) may be laminated using a film, or the sealant layer may be formed using an extruder. As the resin system used for the sealant layer (21), for example, a polyethylene resin or a polypropylene resin can be used.

  Lamination of these films may be bonded using an adhesive, or may be performed by providing, for example, a polyethylene resin layer with an extruder. By providing the sealant layer (19) and the sealant layer (21) on the front and back, respectively, the side seal of the laminated body becomes possible, and the cylindrical molding becomes possible.

  As a result of intensive studies, we have found that the total thickness of the laminate according to the present invention is in the range of 200 μm to 500 μm, which is suitable for body cutting. Appropriate cutting of the body portion can desirably turn the end face inward, and can prevent the metal deposition layer from being exposed at the connection portion with the shoulder opening.

  In addition, as a result of intensive studies, we found that the diameter of the body of the laminated tube is 20 mm or more, which is suitable for cutting the body. Appropriate cutting of the body portion can desirably turn the end face inward, and can prevent the metal deposition layer from being exposed at the connection portion with the shoulder opening. The exposure of the metal vapor deposition layer needs to be prevented because it causes dissolution when the contents containing the component that dissolves the metal vapor deposition layer are attached, and causes delamination of the laminate.

  FIG. 4 is a schematic sectional view of compression molding of a laminated tube shoulder according to the present invention. The shoulder (16) was formed by compression molding because the end face (9) of the trunk (10) was oriented toward the inside of the laminate tube trunk by cutting from the outer circumference of the trunk with an arcuate blade. Sometimes the end face (9) is covered with the resin at the shoulder and the cross section of the laminate is not exposed.

  Therefore, it is possible to avoid the contents including the component that dissolves the metal deposition layer, such as toothpaste, from adhering to the joint between the shoulder and the torso, so that the metal deposition layer is dissolved and the laminate is peeled off. become.

  Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to this.

<Example 1>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut it with four half-moon blades through a mandrel, create a torso, compress the shoulder and compress the laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (low density linear polyethylene film: 50 μm)
Extruded polyethylene (thickness 15 μm) layer Metal-deposited polyethylene terephthalate film (thickness 12 μm)
・ White polyethylene film (thickness 120μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 80 μm)
The total thickness of the laminate is 307 μm and the tube diameter is 40 mm.

<Example 2>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut it with four half-moon blades through a mandrel, create a torso, compress the shoulder and compress the laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (low density linear polyethylene film: 90 μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness: 200μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 150 μm)
The total thickness of the laminate is 500 μm and the tube diameter is 40 mm.

<Example 3>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut it with four half-moon blades through a mandrel, create a torso, compress the shoulder and compress the laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (extruded polyethylene layer: 30 μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness 50μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 60 μm)
The total thickness of the laminate is 200 μm, and the tube diameter is 40 mm.

<Example 4>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut with two half-moon blades through a mandrel to create a torso, compression molding the shoulder, and laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (low density linear polyethylene film: 50 μm)
-Extruded polyethylene layer (thickness 15μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness 120μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 80 μm)
The total thickness of the laminate is 307 μm, and the tube diameter is 20 mm.

<Comparative Example 1>
A laminate having the following material composition was prepared, side-sealed with an AMS machine, then pulled out from the mandrel and pushed from above with a single blade to create a torso, and a shoulder tube was compression molded to produce a laminate tube.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (low density linear polyethylene film: 50 μm)
-Extruded polyethylene layer (thickness 15μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness 120μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 80 μm)
The total thickness of the laminate is 307 μm and the tube diameter is 40 mm.

<Comparative example 2>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut with two half-moon blades through a mandrel to create a torso, compression molding the shoulder, and laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (extruded polyethylene layer: 30 μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness 50μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 60 μm)
The total thickness of the laminate is 200 μm, and the tube diameter is 18 mm.

<Comparative Example 3>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut with two half-moon blades through a mandrel to create a torso, compression molding the shoulder, and laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer, coating layer (post ink, varnish)
-Sealant layer (extruded polyethylene layer: 30 μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness 30μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 60 μm)
The total thickness of the laminate is 180 μm and the tube diameter is 40 mm.

<Comparative example 4>
Create a laminate with the following material composition, side-seal with an AMS machine, then cut with two half-moon blades through a mandrel to create a torso, compression molding the shoulder, and laminate tube Created.
The material composition is as follows from the surface of the laminate.
・ Printing layer (post ink / varnish)
-Sealant layer, coating layer (low density linear polyethylene film: 90 μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Metal-deposited polyethylene terephthalate film (thickness 12μm)
・ White polyethylene film (thickness: 200μm)
・ Extruded polyethylene layer (thickness: 18μm)
・ Gas barrier film (polyethylene terephthalate film: thickness 12μm)
・ Adhesive / sealant layer (low density linear polyethylene film: 180 μm)
The total thickness of the laminate is 530 μm and the tube diameter is 40 mm.

<Evaluation method>
(1) Whether cutting is possible: In each test sample, whether cutting is possible is evaluated. Those that cannot be cut cannot be evaluated for molding and immersion.
(2) Cross-sectional observation: Compression molding is performed to observe a connection portion with the body portion. The state where the end face faces inward and is covered with the resin at the shoulder is a good state.
(3) Immersion test: The connected portion is immersed in a toothpaste and observed whether dissolution is observed in the post-deposition layer at 50 ° C. for 3 days. Evaluation was performed at n = 5. Evaluation criteria were as follows: ○: no dissolution, x: dissolution occurred.

<Evaluation results>
The evaluation results are shown in Table 1.

  In the results shown in Table 1, all of Examples 1 to 4 were cleavable as to whether or not severing was possible. In cross-sectional observation, the cut end face was inward and covered with resin at the shoulder. In the immersion test, no dissolution of the vapor deposition was observed. Therefore, it was a good result in all the evaluation items, and it was verified that the problem can be solved by the present invention.

  In Comparative Example 1, cutting was possible, but in the cross-sectional observation, the end face was outward and not covered with the shoulder resin. This can be presumed to be a result of the cutting method being pushed from one side with a single blade without using an arcuate blade. As a result, in the immersion test, dissolution of the metal deposition layer occurred in 3/5.

  In the comparative example 2, it is a result that it cannot cut | disconnect by the possibility of cutting | disconnection. This is probably due to the tube diameter being 18 mm. From the comparison with Example 4, the diameter of the tube needs to be 20 mm or more.

  In the comparative example 3, it is a result that it cannot cut | disconnect by the possibility of cutting | disconnection. This is considered to be mainly due to the total thickness of the laminate being 180 μm. From a comparison with Example 3, the total thickness of the laminate is required to be 200 μm or more.

  In the comparative example 4, it is a result that it cannot cut | disconnect by the possibility of cutting | disconnection. This is considered to be mainly due to the total thickness of the laminated body being 530 μm. In comparison with Example 2, the total thickness of the laminate is required to be 500 μm or less. That is, the total thickness of the laminate must be in the range of 200 μm to 500 μm.

  From the above results, according to the present invention, in the laminated tube containing the metal vapor-deposited film in the laminate constituting the body portion, the metal vapor-deposited layer at the shoulder of the laminate tube is dissolved, and the film is thereby delaminated. It is possible to provide a method for producing a laminated tube having no crack.

DESCRIPTION OF SYMBOLS 1 ... Laminated body 2 ... Mandrel 3a ... Arc-shaped blade 1
3b ... Arc-shaped blade 2
4 ... barrel portion 5 ... end face 9 ... end face 10 ... barrel portion 11 ... outermost surface 12 of laminated body ... metal-deposited polyethylene terephthalate film 13 ... thickness direction center 14 ..Total thickness 15 of laminated body 16 ... diameter 16 ... shoulder 17 ... base material layer 18 ... metal vapor deposition film 19 ... sealant layer 20 ... gas barrier film 21 ... sealant layer 22 ... Print layer 23 ... Laminate tube outer side 24 ... Wetted surface side 25 ... Coating layer

Claims (3)

In the manufacturing method of the laminate tube in which the body portion is configured with a laminate including a metal-deposited film,
After the side seal of the laminate is made into a cylindrical shape, a mandrel is inserted, and the barrel is formed so that the end face faces inward by pushing it with two or more arc-shaped blades from the top of the cylindrical laminate. And
A method of manufacturing a laminated tube, comprising forming a shoulder of the tube at an end of the trunk.   The diameter of the said laminated tube trunk | drum is 20 mm or more, The manufacturing method of the laminated tube of Claim 1 characterized by the above-mentioned.   The laminate tube manufacturing method according to claim 1 or 2, wherein a thickness of the laminate constituting the laminate tube body is in a range of 200 µm to 500 µm.